I know customer grid tool can mess with what you see in game - but to be sure I did a clean install so no files are messed with and I still don't see anything from the Le Mans DLC (ie LMP 1 2016 / 917LH the 2 512s, the track....)

My steam account seems fine as the DLCs are included in the pre order and I see this in steam:

Click image for larger version. 

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Any ideas ?